1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_RUNTIME_GLOBALS_HPP 26 #define SHARE_RUNTIME_GLOBALS_HPP 27 28 #include "compiler/compiler_globals.hpp" 29 #include "gc/shared/gc_globals.hpp" 30 #include "runtime/globals_shared.hpp" 31 #include "utilities/align.hpp" 32 #include "utilities/globalDefinitions.hpp" 33 #include "utilities/macros.hpp" 34 #include CPU_HEADER(globals) 35 #include OS_HEADER(globals) 36 #include OS_CPU_HEADER(globals) 37 38 // develop flags are settable / visible only during development and are constant in the PRODUCT version 39 // product flags are always settable / visible 40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 41 42 // A flag must be declared with one of the following types: 43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. 44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used 45 // only in this file, because the macrology requires single-token type names. 46 47 // Note: Diagnostic options not meant for VM tuning or for product modes. 48 // They are to be used for VM quality assurance or field diagnosis 49 // of VM bugs. They are hidden so that users will not be encouraged to 50 // try them as if they were VM ordinary execution options. However, they 51 // are available in the product version of the VM. Under instruction 52 // from support engineers, VM customers can turn them on to collect 53 // diagnostic information about VM problems. To use a VM diagnostic 54 // option, you must first specify +UnlockDiagnosticVMOptions. 55 // (This master switch also affects the behavior of -Xprintflags.) 56 // 57 // experimental flags are in support of features that are not 58 // part of the officially supported product, but are available 59 // for experimenting with. They could, for example, be performance 60 // features that may not have undergone full or rigorous QA, but which may 61 // help performance in some cases and released for experimentation 62 // by the community of users and developers. This flag also allows one to 63 // be able to build a fully supported product that nonetheless also 64 // ships with some unsupported, lightly tested, experimental features. 65 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 66 // UnlockExperimentalVMOptions flag, which allows the control and 67 // modification of the experimental flags. 68 // 69 // Nota bene: neither diagnostic nor experimental options should be used casually, 70 // and they are not supported on production loads, except under explicit 71 // direction from support engineers. 72 // 73 // manageable flags are writeable external product flags. 74 // They are dynamically writeable through the JDK management interface 75 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 76 // These flags are external exported interface (see CCC). The list of 77 // manageable flags can be queried programmatically through the management 78 // interface. 79 // 80 // A flag can be made as "manageable" only if 81 // - the flag is defined in a CCC as an external exported interface. 82 // - the VM implementation supports dynamic setting of the flag. 83 // This implies that the VM must *always* query the flag variable 84 // and not reuse state related to the flag state at any given time. 85 // - you want the flag to be queried programmatically by the customers. 86 // 87 // product_rw flags are writeable internal product flags. 88 // They are like "manageable" flags but for internal/private use. 89 // The list of product_rw flags are internal/private flags which 90 // may be changed/removed in a future release. It can be set 91 // through the management interface to get/set value 92 // when the name of flag is supplied. 93 // 94 // A flag can be made as "product_rw" only if 95 // - the VM implementation supports dynamic setting of the flag. 96 // This implies that the VM must *always* query the flag variable 97 // and not reuse state related to the flag state at any given time. 98 // 99 // Note that when there is a need to support develop flags to be writeable, 100 // it can be done in the same way as product_rw. 101 // 102 // range is a macro that will expand to min and max arguments for range 103 // checking code if provided - see jvmFlagRangeList.hpp 104 // 105 // constraint is a macro that will expand to custom function call 106 // for constraint checking if provided - see jvmFlagConstraintList.hpp 107 108 // Default and minimum StringTable and SymbolTable size values 109 // Must be powers of 2 110 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 111 const size_t minimumStringTableSize = 128; 112 const size_t defaultSymbolTableSize = 32768; // 2^15 113 const size_t minimumSymbolTableSize = 1024; 114 115 #define RUNTIME_FLAGS(develop, \ 116 develop_pd, \ 117 product, \ 118 product_pd, \ 119 diagnostic, \ 120 diagnostic_pd, \ 121 experimental, \ 122 notproduct, \ 123 manageable, \ 124 product_rw, \ 125 lp64_product, \ 126 range, \ 127 constraint) \ 128 \ 129 lp64_product(bool, UseCompressedOops, false, \ 130 "Use 32-bit object references in 64-bit VM. " \ 131 "lp64_product means flag is always constant in 32 bit VM") \ 132 \ 133 lp64_product(bool, UseCompressedClassPointers, false, \ 134 "Use 32-bit class pointers in 64-bit VM. " \ 135 "lp64_product means flag is always constant in 32 bit VM") \ 136 \ 137 notproduct(bool, CheckCompressedOops, true, \ 138 "Generate checks in encoding/decoding code in debug VM") \ 139 \ 140 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 141 "Heap allocation steps through preferred address regions to find" \ 142 " where it can allocate the heap. Number of steps to take per " \ 143 "region.") \ 144 range(1, max_uintx) \ 145 \ 146 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 147 "Default object alignment in bytes, 8 is minimum") \ 148 range(8, 256) \ 149 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 150 \ 151 develop(bool, CleanChunkPoolAsync, true, \ 152 "Clean the chunk pool asynchronously") \ 153 \ 154 diagnostic(uint, HandshakeTimeout, 0, \ 155 "If nonzero set a timeout in milliseconds for handshakes") \ 156 \ 157 experimental(bool, AlwaysSafeConstructors, false, \ 158 "Force safe construction, as if all fields are final.") \ 159 \ 160 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 161 "Enable normal processing of flags relating to field diagnostics")\ 162 \ 163 experimental(bool, UnlockExperimentalVMOptions, false, \ 164 "Enable normal processing of flags relating to experimental " \ 165 "features") \ 166 \ 167 product(bool, JavaMonitorsInStackTrace, true, \ 168 "Print information about Java monitor locks when the stacks are" \ 169 "dumped") \ 170 \ 171 product_pd(bool, UseLargePages, \ 172 "Use large page memory") \ 173 \ 174 product_pd(bool, UseLargePagesIndividualAllocation, \ 175 "Allocate large pages individually for better affinity") \ 176 \ 177 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 178 "Fail large pages individual allocation") \ 179 \ 180 product(bool, UseLargePagesInMetaspace, false, \ 181 "Use large page memory in metaspace. " \ 182 "Only used if UseLargePages is enabled.") \ 183 \ 184 product(bool, UseNUMA, false, \ 185 "Use NUMA if available") \ 186 \ 187 product(bool, UseNUMAInterleaving, false, \ 188 "Interleave memory across NUMA nodes if available") \ 189 \ 190 product(size_t, NUMAInterleaveGranularity, 2*M, \ 191 "Granularity to use for NUMA interleaving on Windows OS") \ 192 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 193 \ 194 product(bool, ForceNUMA, false, \ 195 "(Deprecated) Force NUMA optimizations on single-node/UMA systems") \ 196 \ 197 product(uintx, NUMAChunkResizeWeight, 20, \ 198 "Percentage (0-100) used to weight the current sample when " \ 199 "computing exponentially decaying average for " \ 200 "AdaptiveNUMAChunkSizing") \ 201 range(0, 100) \ 202 \ 203 product(size_t, NUMASpaceResizeRate, 1*G, \ 204 "Do not reallocate more than this amount per collection") \ 205 range(0, max_uintx) \ 206 \ 207 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 208 "Enable adaptive chunk sizing for NUMA") \ 209 \ 210 product(bool, NUMAStats, false, \ 211 "Print NUMA stats in detailed heap information") \ 212 \ 213 product(uintx, NUMAPageScanRate, 256, \ 214 "Maximum number of pages to include in the page scan procedure") \ 215 range(0, max_uintx) \ 216 \ 217 product(bool, UseAES, false, \ 218 "Control whether AES instructions are used when available") \ 219 \ 220 product(bool, UseFMA, false, \ 221 "Control whether FMA instructions are used when available") \ 222 \ 223 product(bool, UseSHA, false, \ 224 "Control whether SHA instructions are used when available") \ 225 \ 226 diagnostic(bool, UseGHASHIntrinsics, false, \ 227 "Use intrinsics for GHASH versions of crypto") \ 228 \ 229 product(bool, UseBASE64Intrinsics, false, \ 230 "Use intrinsics for java.util.Base64") \ 231 \ 232 product(size_t, LargePageSizeInBytes, 0, \ 233 "Large page size (0 to let VM choose the page size)") \ 234 range(0, max_uintx) \ 235 \ 236 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 237 "Use large pages if maximum heap is at least this big") \ 238 range(0, max_uintx) \ 239 \ 240 product(bool, ForceTimeHighResolution, false, \ 241 "Using high time resolution (for Win32 only)") \ 242 \ 243 develop(bool, TracePcPatching, false, \ 244 "Trace usage of frame::patch_pc") \ 245 \ 246 develop(bool, TraceRelocator, false, \ 247 "Trace the bytecode relocator") \ 248 \ 249 develop(bool, TraceLongCompiles, false, \ 250 "Print out every time compilation is longer than " \ 251 "a given threshold") \ 252 \ 253 diagnostic(bool, SafepointALot, false, \ 254 "Generate a lot of safepoints. This works with " \ 255 "GuaranteedSafepointInterval") \ 256 \ 257 diagnostic(bool, HandshakeALot, false, \ 258 "Generate a lot of handshakes. This works with " \ 259 "GuaranteedSafepointInterval") \ 260 \ 261 product_pd(bool, BackgroundCompilation, \ 262 "A thread requesting compilation is not blocked during " \ 263 "compilation") \ 264 \ 265 product(bool, PrintVMQWaitTime, false, \ 266 "(Deprecated) Print out the waiting time in VM operation queue") \ 267 \ 268 product(bool, MethodFlushing, true, \ 269 "Reclamation of zombie and not-entrant methods") \ 270 \ 271 develop(bool, VerifyStack, false, \ 272 "Verify stack of each thread when it is entering a runtime call") \ 273 \ 274 diagnostic(bool, ForceUnreachable, false, \ 275 "Make all non code cache addresses to be unreachable by " \ 276 "forcing use of 64bit literal fixups") \ 277 \ 278 notproduct(bool, StressDerivedPointers, false, \ 279 "Force scavenge when a derived pointer is detected on stack " \ 280 "after rtm call") \ 281 \ 282 develop(bool, TraceDerivedPointers, false, \ 283 "Trace traversal of derived pointers on stack") \ 284 \ 285 notproduct(bool, TraceCodeBlobStacks, false, \ 286 "Trace stack-walk of codeblobs") \ 287 \ 288 notproduct(bool, PrintRewrites, false, \ 289 "Print methods that are being rewritten") \ 290 \ 291 product(bool, UseInlineCaches, true, \ 292 "Use Inline Caches for virtual calls ") \ 293 \ 294 diagnostic(bool, InlineArrayCopy, true, \ 295 "Inline arraycopy native that is known to be part of " \ 296 "base library DLL") \ 297 \ 298 diagnostic(bool, InlineObjectHash, true, \ 299 "Inline Object::hashCode() native that is known to be part " \ 300 "of base library DLL") \ 301 \ 302 diagnostic(bool, InlineNatives, true, \ 303 "Inline natives that are known to be part of base library DLL") \ 304 \ 305 diagnostic(bool, InlineMathNatives, true, \ 306 "Inline SinD, CosD, etc.") \ 307 \ 308 diagnostic(bool, InlineClassNatives, true, \ 309 "Inline Class.isInstance, etc") \ 310 \ 311 diagnostic(bool, InlineThreadNatives, true, \ 312 "Inline Thread.currentThread, etc") \ 313 \ 314 diagnostic(bool, InlineUnsafeOps, true, \ 315 "Inline memory ops (native methods) from Unsafe") \ 316 \ 317 product(bool, CriticalJNINatives, true, \ 318 "Check for critical JNI entry points") \ 319 \ 320 notproduct(bool, StressCriticalJNINatives, false, \ 321 "Exercise register saving code in critical natives") \ 322 \ 323 diagnostic(bool, UseAESIntrinsics, false, \ 324 "Use intrinsics for AES versions of crypto") \ 325 \ 326 diagnostic(bool, UseAESCTRIntrinsics, false, \ 327 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 328 \ 329 diagnostic(bool, UseSHA1Intrinsics, false, \ 330 "Use intrinsics for SHA-1 crypto hash function. " \ 331 "Requires that UseSHA is enabled.") \ 332 \ 333 diagnostic(bool, UseSHA256Intrinsics, false, \ 334 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 335 "Requires that UseSHA is enabled.") \ 336 \ 337 diagnostic(bool, UseSHA512Intrinsics, false, \ 338 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 339 "Requires that UseSHA is enabled.") \ 340 \ 341 diagnostic(bool, UseCRC32Intrinsics, false, \ 342 "use intrinsics for java.util.zip.CRC32") \ 343 \ 344 diagnostic(bool, UseCRC32CIntrinsics, false, \ 345 "use intrinsics for java.util.zip.CRC32C") \ 346 \ 347 diagnostic(bool, UseAdler32Intrinsics, false, \ 348 "use intrinsics for java.util.zip.Adler32") \ 349 \ 350 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 351 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 352 \ 353 diagnostic(ccstrlist, DisableIntrinsic, "", \ 354 "do not expand intrinsics whose (internal) names appear here") \ 355 \ 356 develop(bool, TraceCallFixup, false, \ 357 "Trace all call fixups") \ 358 \ 359 develop(bool, DeoptimizeALot, false, \ 360 "Deoptimize at every exit from the runtime system") \ 361 \ 362 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 363 "A comma separated list of bcis to deoptimize at") \ 364 \ 365 develop(bool, DeoptimizeRandom, false, \ 366 "Deoptimize random frames on random exit from the runtime system")\ 367 \ 368 notproduct(bool, ZombieALot, false, \ 369 "Create zombies (non-entrant) at exit from the runtime system") \ 370 \ 371 notproduct(bool, WalkStackALot, false, \ 372 "Trace stack (no print) at every exit from the runtime system") \ 373 \ 374 product(bool, Debugging, false, \ 375 "Set when executing debug methods in debug.cpp " \ 376 "(to prevent triggering assertions)") \ 377 \ 378 notproduct(bool, VerifyLastFrame, false, \ 379 "Verify oops on last frame on entry to VM") \ 380 \ 381 product(bool, SafepointTimeout, false, \ 382 "Time out and warn or fail after SafepointTimeoutDelay " \ 383 "milliseconds if failed to reach safepoint") \ 384 \ 385 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 386 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 387 \ 388 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 389 "Abort upon failure to complete VM operation promptly") \ 390 \ 391 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 392 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 393 range(0, max_intx) \ 394 \ 395 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 396 /* typically, at most a few retries are needed */ \ 397 product(intx, SuspendRetryCount, 50, \ 398 "Maximum retry count for an external suspend request") \ 399 range(0, max_intx) \ 400 \ 401 product(intx, SuspendRetryDelay, 5, \ 402 "Milliseconds to delay per retry (* current_retry_count)") \ 403 range(0, max_intx) \ 404 \ 405 product(bool, AssertOnSuspendWaitFailure, false, \ 406 "Assert/Guarantee on external suspend wait failure") \ 407 \ 408 product(bool, TraceSuspendWaitFailures, false, \ 409 "Trace external suspend wait failures") \ 410 \ 411 product(bool, MaxFDLimit, true, \ 412 "Bump the number of file descriptors to maximum in Solaris") \ 413 \ 414 diagnostic(bool, LogEvents, true, \ 415 "Enable the various ring buffer event logs") \ 416 \ 417 diagnostic(uintx, LogEventsBufferEntries, 20, \ 418 "Number of ring buffer event logs") \ 419 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 420 \ 421 diagnostic(bool, BytecodeVerificationRemote, true, \ 422 "Enable the Java bytecode verifier for remote classes") \ 423 \ 424 diagnostic(bool, BytecodeVerificationLocal, false, \ 425 "Enable the Java bytecode verifier for local classes") \ 426 \ 427 develop(bool, ForceFloatExceptions, trueInDebug, \ 428 "Force exceptions on FP stack under/overflow") \ 429 \ 430 develop(bool, VerifyStackAtCalls, false, \ 431 "Verify that the stack pointer is unchanged after calls") \ 432 \ 433 develop(bool, TraceJavaAssertions, false, \ 434 "Trace java language assertions") \ 435 \ 436 notproduct(bool, VerifyCodeCache, false, \ 437 "Verify code cache on memory allocation/deallocation") \ 438 \ 439 develop(bool, UseMallocOnly, false, \ 440 "Use only malloc/free for allocation (no resource area/arena)") \ 441 \ 442 develop(bool, ZapResourceArea, trueInDebug, \ 443 "Zap freed resource/arena space with 0xABABABAB") \ 444 \ 445 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 446 "Zap freed VM handle space with 0xBCBCBCBC") \ 447 \ 448 notproduct(bool, ZapStackSegments, trueInDebug, \ 449 "Zap allocated/freed stack segments with 0xFADFADED") \ 450 \ 451 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 452 "Zap unused heap space with 0xBAADBABE") \ 453 \ 454 develop(bool, CheckZapUnusedHeapArea, false, \ 455 "Check zapping of unused heap space") \ 456 \ 457 develop(bool, ZapFillerObjects, trueInDebug, \ 458 "Zap filler objects with 0xDEAFBABE") \ 459 \ 460 develop(bool, PrintVMMessages, true, \ 461 "Print VM messages on console") \ 462 \ 463 notproduct(uintx, ErrorHandlerTest, 0, \ 464 "If > 0, provokes an error after VM initialization; the value " \ 465 "determines which error to provoke. See test_error_handler() " \ 466 "in vmError.cpp.") \ 467 \ 468 notproduct(uintx, TestCrashInErrorHandler, 0, \ 469 "If > 0, provokes an error inside VM error handler (a secondary " \ 470 "crash). see test_error_handler() in vmError.cpp") \ 471 \ 472 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 473 "If true, tests SafeFetch inside error handler.") \ 474 \ 475 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 476 "If true, simulates an unresponsive error handler.") \ 477 \ 478 develop(bool, Verbose, false, \ 479 "Print additional debugging information from other modes") \ 480 \ 481 develop(bool, PrintMiscellaneous, false, \ 482 "Print uncategorized debugging information (requires +Verbose)") \ 483 \ 484 develop(bool, WizardMode, false, \ 485 "Print much more debugging information") \ 486 \ 487 product(bool, ShowMessageBoxOnError, false, \ 488 "Keep process alive on VM fatal error") \ 489 \ 490 product(bool, CreateCoredumpOnCrash, true, \ 491 "Create core/mini dump on VM fatal error") \ 492 \ 493 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 494 "Timeout, in seconds, to limit the time spent on writing an " \ 495 "error log in case of a crash.") \ 496 range(0, (uint64_t)max_jlong/1000) \ 497 \ 498 product_pd(bool, UseOSErrorReporting, \ 499 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 500 \ 501 product(bool, SuppressFatalErrorMessage, false, \ 502 "Report NO fatal error message (avoid deadlock)") \ 503 \ 504 product(ccstrlist, OnError, "", \ 505 "Run user-defined commands on fatal error; see VMError.cpp " \ 506 "for examples") \ 507 \ 508 product(ccstrlist, OnOutOfMemoryError, "", \ 509 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 510 \ 511 manageable(bool, HeapDumpBeforeFullGC, false, \ 512 "Dump heap to file before any major stop-the-world GC") \ 513 \ 514 manageable(bool, HeapDumpAfterFullGC, false, \ 515 "Dump heap to file after any major stop-the-world GC") \ 516 \ 517 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 518 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 519 \ 520 manageable(ccstr, HeapDumpPath, NULL, \ 521 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 522 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 523 "in the working directory)") \ 524 \ 525 develop(bool, BreakAtWarning, false, \ 526 "Execute breakpoint upon encountering VM warning") \ 527 \ 528 product(ccstr, NativeMemoryTracking, "off", \ 529 "Native memory tracking options") \ 530 \ 531 diagnostic(bool, PrintNMTStatistics, false, \ 532 "Print native memory tracking summary data if it is on") \ 533 \ 534 diagnostic(bool, LogCompilation, false, \ 535 "Log compilation activity in detail to LogFile") \ 536 \ 537 product(bool, PrintCompilation, false, \ 538 "Print compilations") \ 539 \ 540 product(bool, PrintExtendedThreadInfo, false, \ 541 "Print more information in thread dump") \ 542 \ 543 diagnostic(intx, ScavengeRootsInCode, 2, \ 544 "0: do not allow scavengable oops in the code cache; " \ 545 "1: allow scavenging from the code cache; " \ 546 "2: emit as many constants as the compiler can see") \ 547 range(0, 2) \ 548 \ 549 product(bool, AlwaysRestoreFPU, false, \ 550 "Restore the FPU control word after every JNI call (expensive)") \ 551 \ 552 diagnostic(bool, PrintCompilation2, false, \ 553 "Print additional statistics per compilation") \ 554 \ 555 diagnostic(bool, PrintAdapterHandlers, false, \ 556 "Print code generated for i2c/c2i adapters") \ 557 \ 558 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 559 "Verify that i2c/c2i adapters are called properly") \ 560 \ 561 develop(bool, VerifyAdapterSharing, false, \ 562 "Verify that the code for shared adapters is the equivalent") \ 563 \ 564 diagnostic(bool, PrintAssembly, false, \ 565 "Print assembly code (using external disassembler.so)") \ 566 \ 567 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 568 "Print options string passed to disassembler.so") \ 569 \ 570 notproduct(bool, PrintNMethodStatistics, false, \ 571 "Print a summary statistic for the generated nmethods") \ 572 \ 573 diagnostic(bool, PrintNMethods, false, \ 574 "Print assembly code for nmethods when generated") \ 575 \ 576 diagnostic(bool, PrintNativeNMethods, false, \ 577 "Print assembly code for native nmethods when generated") \ 578 \ 579 develop(bool, PrintDebugInfo, false, \ 580 "Print debug information for all nmethods when generated") \ 581 \ 582 develop(bool, PrintRelocations, false, \ 583 "Print relocation information for all nmethods when generated") \ 584 \ 585 develop(bool, PrintDependencies, false, \ 586 "Print dependency information for all nmethods when generated") \ 587 \ 588 develop(bool, PrintExceptionHandlers, false, \ 589 "Print exception handler tables for all nmethods when generated") \ 590 \ 591 develop(bool, StressCompiledExceptionHandlers, false, \ 592 "Exercise compiled exception handlers") \ 593 \ 594 develop(bool, InterceptOSException, false, \ 595 "Start debugger when an implicit OS (e.g. NULL) " \ 596 "exception happens") \ 597 \ 598 product(bool, PrintCodeCache, false, \ 599 "Print the code cache memory usage when exiting") \ 600 \ 601 develop(bool, PrintCodeCache2, false, \ 602 "Print detailed usage information on the code cache when exiting")\ 603 \ 604 product(bool, PrintCodeCacheOnCompilation, false, \ 605 "Print the code cache memory usage each time a method is " \ 606 "compiled") \ 607 \ 608 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 609 "Print code heap usage statistics on exit and on full condition") \ 610 \ 611 diagnostic(bool, PrintStubCode, false, \ 612 "Print generated stub code") \ 613 \ 614 product(bool, StackTraceInThrowable, true, \ 615 "Collect backtrace in throwable when exception happens") \ 616 \ 617 product(bool, OmitStackTraceInFastThrow, true, \ 618 "Omit backtraces for some 'hot' exceptions in optimized code") \ 619 \ 620 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 621 "Show exception messages from RuntimeExceptions that contain " \ 622 "snippets of the failing code. Disable this to improve privacy.") \ 623 \ 624 product(bool, PrintWarnings, true, \ 625 "Print JVM warnings to output stream") \ 626 \ 627 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 628 "Print warnings for stalled SpinLocks") \ 629 \ 630 product(bool, RegisterFinalizersAtInit, true, \ 631 "Register finalizable objects at end of Object.<init> or " \ 632 "after allocation") \ 633 \ 634 develop(bool, RegisterReferences, true, \ 635 "Tell whether the VM should register soft/weak/final/phantom " \ 636 "references") \ 637 \ 638 develop(bool, IgnoreRewrites, false, \ 639 "Suppress rewrites of bytecodes in the oopmap generator. " \ 640 "This is unsafe!") \ 641 \ 642 develop(bool, PrintCodeCacheExtension, false, \ 643 "Print extension of code cache") \ 644 \ 645 develop(bool, UsePrivilegedStack, true, \ 646 "Enable the security JVM functions") \ 647 \ 648 develop(bool, ProtectionDomainVerification, true, \ 649 "Verify protection domain before resolution in system dictionary")\ 650 \ 651 product(bool, ClassUnloading, true, \ 652 "Do unloading of classes") \ 653 \ 654 product(bool, ClassUnloadingWithConcurrentMark, true, \ 655 "Do unloading of classes with a concurrent marking cycle") \ 656 \ 657 develop(bool, DisableStartThread, false, \ 658 "Disable starting of additional Java threads " \ 659 "(for debugging only)") \ 660 \ 661 develop(bool, MemProfiling, false, \ 662 "Write memory usage profiling to log file") \ 663 \ 664 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 665 "Print the system dictionary at exit") \ 666 \ 667 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 668 "Dynamically resize system dictionaries as needed") \ 669 \ 670 product(bool, AlwaysLockClassLoader, false, \ 671 "Require the VM to acquire the class loader lock before calling " \ 672 "loadClass() even for class loaders registering " \ 673 "as parallel capable") \ 674 \ 675 product(bool, AllowParallelDefineClass, false, \ 676 "Allow parallel defineClass requests for class loaders " \ 677 "registering as parallel capable") \ 678 \ 679 product_pd(bool, DontYieldALot, \ 680 "Throw away obvious excess yield calls") \ 681 \ 682 develop(bool, UseDetachedThreads, true, \ 683 "Use detached threads that are recycled upon termination " \ 684 "(for Solaris only)") \ 685 \ 686 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 687 "Disable the use of stack guard pages if the JVM is loaded " \ 688 "on the primordial process thread") \ 689 \ 690 product(bool, UseLWPSynchronization, true, \ 691 "Use LWP-based instead of libthread-based synchronization " \ 692 "(SPARC only)") \ 693 \ 694 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 695 "Percentage of used monitors before triggering cleanup " \ 696 "safepoint which deflates monitors (0 is off). " \ 697 "The check is performed on GuaranteedSafepointInterval.") \ 698 range(0, 100) \ 699 \ 700 experimental(intx, hashCode, 5, \ 701 "(Unstable) select hashCode generation algorithm") \ 702 \ 703 product(bool, FilterSpuriousWakeups, true, \ 704 "When true prevents OS-level spurious, or premature, wakeups " \ 705 "from Object.wait (Ignored for Windows)") \ 706 \ 707 develop(bool, UsePthreads, false, \ 708 "Use pthread-based instead of libthread-based synchronization " \ 709 "(SPARC only)") \ 710 \ 711 product(bool, ReduceSignalUsage, false, \ 712 "Reduce the use of OS signals in Java and/or the VM") \ 713 \ 714 develop(bool, LoadLineNumberTables, true, \ 715 "Tell whether the class file parser loads line number tables") \ 716 \ 717 develop(bool, LoadLocalVariableTables, true, \ 718 "Tell whether the class file parser loads local variable tables") \ 719 \ 720 develop(bool, LoadLocalVariableTypeTables, true, \ 721 "Tell whether the class file parser loads local variable type" \ 722 "tables") \ 723 \ 724 product(bool, AllowUserSignalHandlers, false, \ 725 "Do not complain if the application installs signal handlers " \ 726 "(Solaris & Linux only)") \ 727 \ 728 product(bool, UseSignalChaining, true, \ 729 "Use signal-chaining to invoke signal handlers installed " \ 730 "by the application (Solaris & Linux only)") \ 731 \ 732 product(bool, RestoreMXCSROnJNICalls, false, \ 733 "Restore MXCSR when returning from JNI calls") \ 734 \ 735 product(bool, CheckJNICalls, false, \ 736 "Verify all arguments to JNI calls") \ 737 \ 738 product(bool, UseFastJNIAccessors, true, \ 739 "Use optimized versions of Get<Primitive>Field") \ 740 \ 741 product(intx, MaxJNILocalCapacity, 65536, \ 742 "Maximum allowable local JNI handle capacity to " \ 743 "EnsureLocalCapacity() and PushLocalFrame(), " \ 744 "where <= 0 is unlimited, default: 65536") \ 745 range(min_intx, max_intx) \ 746 \ 747 product(bool, EagerXrunInit, false, \ 748 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 749 "but not all -Xrun libraries may support the state of the VM " \ 750 "at this time") \ 751 \ 752 product(bool, PreserveAllAnnotations, false, \ 753 "Preserve RuntimeInvisibleAnnotations as well " \ 754 "as RuntimeVisibleAnnotations") \ 755 \ 756 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 757 "Number of OutOfMemoryErrors preallocated with backtrace") \ 758 \ 759 product(bool, UseXMMForArrayCopy, false, \ 760 "Use SSE2 MOVQ instruction for Arraycopy") \ 761 \ 762 notproduct(bool, PrintFieldLayout, false, \ 763 "Print field layout for each class") \ 764 \ 765 /* Need to limit the extent of the padding to reasonable size. */\ 766 /* 8K is well beyond the reasonable HW cache line size, even with */\ 767 /* aggressive prefetching, while still leaving the room for segregating */\ 768 /* among the distinct pages. */\ 769 product(intx, ContendedPaddingWidth, 128, \ 770 "How many bytes to pad the fields/classes marked @Contended with")\ 771 range(0, 8192) \ 772 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 773 \ 774 product(bool, EnableContended, true, \ 775 "Enable @Contended annotation support") \ 776 \ 777 product(bool, RestrictContended, true, \ 778 "Restrict @Contended to trusted classes") \ 779 \ 780 product(bool, UseBiasedLocking, true, \ 781 "Enable biased locking in JVM") \ 782 \ 783 product(intx, BiasedLockingStartupDelay, 0, \ 784 "Number of milliseconds to wait before enabling biased locking") \ 785 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 786 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 787 \ 788 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 789 "Print statistics of biased locking in JVM") \ 790 \ 791 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 792 "Threshold of number of revocations per type to try to " \ 793 "rebias all objects in the heap of that type") \ 794 range(0, max_intx) \ 795 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 796 \ 797 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 798 "Threshold of number of revocations per type to permanently " \ 799 "revoke biases of all objects in the heap of that type") \ 800 range(0, max_intx) \ 801 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 802 \ 803 product(intx, BiasedLockingDecayTime, 25000, \ 804 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 805 "type after previous bulk rebias") \ 806 range(500, max_intx) \ 807 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 808 \ 809 product(bool, ExitOnOutOfMemoryError, false, \ 810 "JVM exits on the first occurrence of an out-of-memory error") \ 811 \ 812 product(bool, CrashOnOutOfMemoryError, false, \ 813 "JVM aborts, producing an error log and core/mini dump, on the " \ 814 "first occurrence of an out-of-memory error") \ 815 \ 816 /* tracing */ \ 817 \ 818 develop(bool, StressRewriter, false, \ 819 "Stress linktime bytecode rewriting") \ 820 \ 821 product(ccstr, TraceJVMTI, NULL, \ 822 "Trace flags for JVMTI functions and events") \ 823 \ 824 /* This option can change an EMCP method into an obsolete method. */ \ 825 /* This can affect tests that except specific methods to be EMCP. */ \ 826 /* This option should be used with caution. */ \ 827 product(bool, StressLdcRewrite, false, \ 828 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 829 \ 830 /* change to false by default sometime after Mustang */ \ 831 product(bool, VerifyMergedCPBytecodes, true, \ 832 "Verify bytecodes after RedefineClasses constant pool merging") \ 833 \ 834 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 835 "(Deprecated) Allow redefinition to add and delete private " \ 836 "static or final methods for compatibility with old releases") \ 837 \ 838 develop(bool, TraceBytecodes, false, \ 839 "Trace bytecode execution") \ 840 \ 841 develop(bool, TraceICs, false, \ 842 "Trace inline cache changes") \ 843 \ 844 notproduct(bool, TraceInvocationCounterOverflow, false, \ 845 "Trace method invocation counter overflow") \ 846 \ 847 develop(bool, TraceInlineCacheClearing, false, \ 848 "Trace clearing of inline caches in nmethods") \ 849 \ 850 develop(bool, TraceDependencies, false, \ 851 "Trace dependencies") \ 852 \ 853 develop(bool, VerifyDependencies, trueInDebug, \ 854 "Exercise and verify the compilation dependency mechanism") \ 855 \ 856 develop(bool, TraceNewOopMapGeneration, false, \ 857 "Trace OopMapGeneration") \ 858 \ 859 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 860 "Trace OopMapGeneration: print detailed cell states") \ 861 \ 862 develop(bool, TimeOopMap, false, \ 863 "Time calls to GenerateOopMap::compute_map() in sum") \ 864 \ 865 develop(bool, TimeOopMap2, false, \ 866 "Time calls to GenerateOopMap::compute_map() individually") \ 867 \ 868 develop(bool, TraceOopMapRewrites, false, \ 869 "Trace rewriting of method oops during oop map generation") \ 870 \ 871 develop(bool, TraceICBuffer, false, \ 872 "Trace usage of IC buffer") \ 873 \ 874 develop(bool, TraceCompiledIC, false, \ 875 "Trace changes of compiled IC") \ 876 \ 877 develop(bool, FLSVerifyDictionary, false, \ 878 "Do lots of (expensive) FLS dictionary verification") \ 879 \ 880 \ 881 notproduct(bool, CheckMemoryInitialization, false, \ 882 "Check memory initialization") \ 883 \ 884 product(uintx, ProcessDistributionStride, 4, \ 885 "Stride through processors when distributing processes") \ 886 range(0, max_juint) \ 887 \ 888 develop(bool, TraceFinalizerRegistration, false, \ 889 "Trace registration of final references") \ 890 \ 891 product(bool, IgnoreEmptyClassPaths, false, \ 892 "Ignore empty path elements in -classpath") \ 893 \ 894 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 895 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 896 "Initial size of the boot class loader data metaspace") \ 897 range(30*K, max_uintx/BytesPerWord) \ 898 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 899 \ 900 product(bool, PrintHeapAtSIGBREAK, true, \ 901 "Print heap layout in response to SIGBREAK") \ 902 \ 903 manageable(bool, PrintClassHistogram, false, \ 904 "Print a histogram of class instances") \ 905 \ 906 experimental(double, ObjectCountCutOffPercent, 0.5, \ 907 "The percentage of the used heap that the instances of a class " \ 908 "must occupy for the class to generate a trace event") \ 909 range(0.0, 100.0) \ 910 \ 911 /* JVMTI heap profiling */ \ 912 \ 913 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 914 "Trace JVMTI object tagging calls") \ 915 \ 916 diagnostic(bool, VerifyBeforeIteration, false, \ 917 "Verify memory system before JVMTI iteration") \ 918 \ 919 /* compiler interface */ \ 920 \ 921 develop(bool, CIPrintCompilerName, false, \ 922 "when CIPrint is active, print the name of the active compiler") \ 923 \ 924 diagnostic(bool, CIPrintCompileQueue, false, \ 925 "display the contents of the compile queue whenever a " \ 926 "compilation is enqueued") \ 927 \ 928 develop(bool, CIPrintRequests, false, \ 929 "display every request for compilation") \ 930 \ 931 product(bool, CITime, false, \ 932 "collect timing information for compilation") \ 933 \ 934 develop(bool, CITimeVerbose, false, \ 935 "be more verbose in compilation timings") \ 936 \ 937 develop(bool, CITimeEach, false, \ 938 "display timing information after each successful compilation") \ 939 \ 940 develop(bool, CICountOSR, false, \ 941 "use a separate counter when assigning ids to osr compilations") \ 942 \ 943 develop(bool, CICompileNatives, true, \ 944 "compile native methods if supported by the compiler") \ 945 \ 946 develop_pd(bool, CICompileOSR, \ 947 "compile on stack replacement methods if supported by the " \ 948 "compiler") \ 949 \ 950 develop(bool, CIPrintMethodCodes, false, \ 951 "print method bytecodes of the compiled code") \ 952 \ 953 develop(bool, CIPrintTypeFlow, false, \ 954 "print the results of ciTypeFlow analysis") \ 955 \ 956 develop(bool, CITraceTypeFlow, false, \ 957 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 958 \ 959 develop(intx, OSROnlyBCI, -1, \ 960 "OSR only at this bci. Negative values mean exclude that bci") \ 961 \ 962 /* compiler */ \ 963 \ 964 /* notice: the max range value here is max_jint, not max_intx */ \ 965 /* because of overflow issue */ \ 966 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 967 "Number of compiler threads to run") \ 968 range(0, max_jint) \ 969 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 970 \ 971 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 972 "Dynamically choose the number of parallel compiler threads") \ 973 \ 974 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 975 "Reduce the number of parallel compiler threads when they " \ 976 "are not used") \ 977 \ 978 diagnostic(bool, TraceCompilerThreads, false, \ 979 "Trace creation and removal of compiler threads") \ 980 \ 981 develop(bool, InjectCompilerCreationFailure, false, \ 982 "Inject thread creation failures for " \ 983 "UseDynamicNumberOfCompilerThreads") \ 984 \ 985 develop(bool, UseStackBanging, true, \ 986 "use stack banging for stack overflow checks (required for " \ 987 "proper StackOverflow handling; disable only to measure cost " \ 988 "of stackbanging)") \ 989 \ 990 develop(bool, GenerateSynchronizationCode, true, \ 991 "generate locking/unlocking code for synchronized methods and " \ 992 "monitors") \ 993 \ 994 develop(bool, GenerateRangeChecks, true, \ 995 "Generate range checks for array accesses") \ 996 \ 997 diagnostic_pd(bool, ImplicitNullChecks, \ 998 "Generate code for implicit null checks") \ 999 \ 1000 product_pd(bool, TrapBasedNullChecks, \ 1001 "Generate code for null checks that uses a cmp and trap " \ 1002 "instruction raising SIGTRAP. This is only used if an access to" \ 1003 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1004 "ImplicitNullChecks don't work (PPC64).") \ 1005 \ 1006 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1007 "Enable Thread SMR extra validity checks") \ 1008 \ 1009 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1010 "Enable Thread SMR Statistics") \ 1011 \ 1012 product(bool, UseNotificationThread, true, \ 1013 "Use Notification Thread") \ 1014 \ 1015 product(bool, Inline, true, \ 1016 "Enable inlining") \ 1017 \ 1018 product(bool, ClipInlining, true, \ 1019 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1020 \ 1021 develop(bool, UseCHA, true, \ 1022 "Enable CHA") \ 1023 \ 1024 product(bool, UseTypeProfile, true, \ 1025 "Check interpreter profile for historically monomorphic calls") \ 1026 \ 1027 diagnostic(bool, PrintInlining, false, \ 1028 "Print inlining optimizations") \ 1029 \ 1030 product(bool, UsePopCountInstruction, false, \ 1031 "Use population count instruction") \ 1032 \ 1033 develop(bool, EagerInitialization, false, \ 1034 "Eagerly initialize classes if possible") \ 1035 \ 1036 diagnostic(bool, LogTouchedMethods, false, \ 1037 "Log methods which have been ever touched in runtime") \ 1038 \ 1039 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1040 "Print all methods that have been ever touched in runtime") \ 1041 \ 1042 develop(bool, TraceMethodReplacement, false, \ 1043 "Print when methods are replaced do to recompilation") \ 1044 \ 1045 develop(bool, PrintMethodFlushing, false, \ 1046 "Print the nmethods being flushed") \ 1047 \ 1048 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1049 "print statistics about method flushing") \ 1050 \ 1051 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1052 "Number of compiled code invocations after which " \ 1053 "the method is considered as hot by the flusher") \ 1054 range(1, max_jint) \ 1055 \ 1056 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1057 "Minimum number of sweeper passes before an nmethod " \ 1058 "can be flushed") \ 1059 range(0, max_intx) \ 1060 \ 1061 product(bool, UseCodeAging, true, \ 1062 "Insert counter to detect warm methods") \ 1063 \ 1064 diagnostic(bool, StressCodeAging, false, \ 1065 "Start with counters compiled in") \ 1066 \ 1067 develop(bool, StressCodeBuffers, false, \ 1068 "Exercise code buffer expansion and other rare state changes") \ 1069 \ 1070 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1071 "Generate extra debugging information for non-safepoints in " \ 1072 "nmethods") \ 1073 \ 1074 product(bool, PrintVMOptions, false, \ 1075 "Print flags that appeared on the command line") \ 1076 \ 1077 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1078 "Ignore unrecognized VM options") \ 1079 \ 1080 product(bool, PrintCommandLineFlags, false, \ 1081 "Print flags specified on command line or set by ergonomics") \ 1082 \ 1083 product(bool, PrintFlagsInitial, false, \ 1084 "Print all VM flags before argument processing and exit VM") \ 1085 \ 1086 product(bool, PrintFlagsFinal, false, \ 1087 "Print all VM flags after argument and ergonomic processing") \ 1088 \ 1089 notproduct(bool, PrintFlagsWithComments, false, \ 1090 "Print all VM flags with default values and descriptions and " \ 1091 "exit") \ 1092 \ 1093 product(bool, PrintFlagsRanges, false, \ 1094 "Print VM flags and their ranges") \ 1095 \ 1096 diagnostic(bool, SerializeVMOutput, true, \ 1097 "Use a mutex to serialize output to tty and LogFile") \ 1098 \ 1099 diagnostic(bool, DisplayVMOutput, true, \ 1100 "Display all VM output on the tty, independently of LogVMOutput") \ 1101 \ 1102 diagnostic(bool, LogVMOutput, false, \ 1103 "Save VM output to LogFile") \ 1104 \ 1105 diagnostic(ccstr, LogFile, NULL, \ 1106 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1107 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1108 \ 1109 product(ccstr, ErrorFile, NULL, \ 1110 "If an error occurs, save the error data to this file " \ 1111 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1112 \ 1113 product(bool, ExtensiveErrorReports, \ 1114 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1115 "Error reports are more extensive.") \ 1116 \ 1117 product(bool, DisplayVMOutputToStderr, false, \ 1118 "If DisplayVMOutput is true, display all VM output to stderr") \ 1119 \ 1120 product(bool, DisplayVMOutputToStdout, false, \ 1121 "If DisplayVMOutput is true, display all VM output to stdout") \ 1122 \ 1123 product(bool, ErrorFileToStderr, false, \ 1124 "If true, error data is printed to stderr instead of a file") \ 1125 \ 1126 product(bool, ErrorFileToStdout, false, \ 1127 "If true, error data is printed to stdout instead of a file") \ 1128 \ 1129 product(bool, UseHeavyMonitors, false, \ 1130 "use heavyweight instead of lightweight Java monitors") \ 1131 \ 1132 product(bool, PrintStringTableStatistics, false, \ 1133 "print statistics about the StringTable and SymbolTable") \ 1134 \ 1135 diagnostic(bool, VerifyStringTableAtExit, false, \ 1136 "verify StringTable contents at exit") \ 1137 \ 1138 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1139 "print histogram of the symbol table") \ 1140 \ 1141 notproduct(bool, ExitVMOnVerifyError, false, \ 1142 "standard exit from VM if bytecode verify error " \ 1143 "(only in debug mode)") \ 1144 \ 1145 diagnostic(ccstr, AbortVMOnException, NULL, \ 1146 "Call fatal if this exception is thrown. Example: " \ 1147 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1148 \ 1149 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1150 "Call fatal if the exception pointed by AbortVMOnException " \ 1151 "has this message") \ 1152 \ 1153 develop(bool, DebugVtables, false, \ 1154 "add debugging code to vtable dispatch") \ 1155 \ 1156 notproduct(bool, PrintVtableStats, false, \ 1157 "print vtables stats at end of run") \ 1158 \ 1159 develop(bool, TraceCreateZombies, false, \ 1160 "trace creation of zombie nmethods") \ 1161 \ 1162 product(bool, RangeCheckElimination, true, \ 1163 "Eliminate range checks") \ 1164 \ 1165 develop_pd(bool, UncommonNullCast, \ 1166 "track occurrences of null in casts; adjust compiler tactics") \ 1167 \ 1168 develop(bool, TypeProfileCasts, true, \ 1169 "treat casts like calls for purposes of type profiling") \ 1170 \ 1171 develop(bool, TraceLivenessGen, false, \ 1172 "Trace the generation of liveness analysis information") \ 1173 \ 1174 notproduct(bool, TraceLivenessQuery, false, \ 1175 "Trace queries of liveness analysis information") \ 1176 \ 1177 notproduct(bool, CollectIndexSetStatistics, false, \ 1178 "Collect information about IndexSets") \ 1179 \ 1180 develop(bool, UseLoopSafepoints, true, \ 1181 "Generate Safepoint nodes in every loop") \ 1182 \ 1183 develop(intx, FastAllocateSizeLimit, 128*K, \ 1184 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1185 "Inline allocations larger than this in doublewords must go slow")\ 1186 \ 1187 product_pd(bool, CompactStrings, \ 1188 "Enable Strings to use single byte chars in backing store") \ 1189 \ 1190 product_pd(uintx, TypeProfileLevel, \ 1191 "=XYZ, with Z: Type profiling of arguments at call; " \ 1192 "Y: Type profiling of return value at call; " \ 1193 "X: Type profiling of parameters to methods; " \ 1194 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1195 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1196 \ 1197 product(intx, TypeProfileArgsLimit, 2, \ 1198 "max number of call arguments to consider for type profiling") \ 1199 range(0, 16) \ 1200 \ 1201 product(intx, TypeProfileParmsLimit, 2, \ 1202 "max number of incoming parameters to consider for type profiling"\ 1203 ", -1 for all") \ 1204 range(-1, 64) \ 1205 \ 1206 /* statistics */ \ 1207 develop(bool, CountCompiledCalls, false, \ 1208 "Count method invocations") \ 1209 \ 1210 notproduct(bool, CountRuntimeCalls, false, \ 1211 "Count VM runtime calls") \ 1212 \ 1213 develop(bool, CountJNICalls, false, \ 1214 "Count jni method invocations") \ 1215 \ 1216 notproduct(bool, CountJVMCalls, false, \ 1217 "Count jvm method invocations") \ 1218 \ 1219 notproduct(bool, CountRemovableExceptions, false, \ 1220 "Count exceptions that could be replaced by branches due to " \ 1221 "inlining") \ 1222 \ 1223 notproduct(bool, ICMissHistogram, false, \ 1224 "Produce histogram of IC misses") \ 1225 \ 1226 /* interpreter */ \ 1227 product_pd(bool, RewriteBytecodes, \ 1228 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1229 \ 1230 product_pd(bool, RewriteFrequentPairs, \ 1231 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1232 \ 1233 diagnostic(bool, PrintInterpreter, false, \ 1234 "Print the generated interpreter code") \ 1235 \ 1236 product(bool, UseInterpreter, true, \ 1237 "Use interpreter for non-compiled methods") \ 1238 \ 1239 develop(bool, UseFastSignatureHandlers, true, \ 1240 "Use fast signature handlers for native calls") \ 1241 \ 1242 product(bool, UseLoopCounter, true, \ 1243 "Increment invocation counter on backward branch") \ 1244 \ 1245 product_pd(bool, UseOnStackReplacement, \ 1246 "Use on stack replacement, calls runtime if invoc. counter " \ 1247 "overflows in loop") \ 1248 \ 1249 notproduct(bool, TraceOnStackReplacement, false, \ 1250 "Trace on stack replacement") \ 1251 \ 1252 product_pd(bool, PreferInterpreterNativeStubs, \ 1253 "Use always interpreter stubs for native methods invoked via " \ 1254 "interpreter") \ 1255 \ 1256 develop(bool, CountBytecodes, false, \ 1257 "Count number of bytecodes executed") \ 1258 \ 1259 develop(bool, PrintBytecodeHistogram, false, \ 1260 "Print histogram of the executed bytecodes") \ 1261 \ 1262 develop(bool, PrintBytecodePairHistogram, false, \ 1263 "Print histogram of the executed bytecode pairs") \ 1264 \ 1265 diagnostic(bool, PrintSignatureHandlers, false, \ 1266 "Print code generated for native method signature handlers") \ 1267 \ 1268 develop(bool, VerifyOops, false, \ 1269 "Do plausibility checks for oops") \ 1270 \ 1271 develop(bool, CheckUnhandledOops, false, \ 1272 "Check for unhandled oops in VM code") \ 1273 \ 1274 develop(bool, VerifyJNIFields, trueInDebug, \ 1275 "Verify jfieldIDs for instance fields") \ 1276 \ 1277 notproduct(bool, VerifyJNIEnvThread, false, \ 1278 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1279 "from JNI") \ 1280 \ 1281 develop(bool, VerifyFPU, false, \ 1282 "Verify FPU state (check for NaN's, etc.)") \ 1283 \ 1284 develop(bool, VerifyThread, false, \ 1285 "Watch the thread register for corruption (SPARC only)") \ 1286 \ 1287 develop(bool, VerifyActivationFrameSize, false, \ 1288 "Verify that activation frame didn't become smaller than its " \ 1289 "minimal size") \ 1290 \ 1291 develop(bool, TraceFrequencyInlining, false, \ 1292 "Trace frequency based inlining") \ 1293 \ 1294 develop_pd(bool, InlineIntrinsics, \ 1295 "Inline intrinsics that can be statically resolved") \ 1296 \ 1297 product_pd(bool, ProfileInterpreter, \ 1298 "Profile at the bytecode level during interpretation") \ 1299 \ 1300 develop(bool, TraceProfileInterpreter, false, \ 1301 "Trace profiling at the bytecode level during interpretation. " \ 1302 "This outputs the profiling information collected to improve " \ 1303 "jit compilation.") \ 1304 \ 1305 develop_pd(bool, ProfileTraps, \ 1306 "Profile deoptimization traps at the bytecode level") \ 1307 \ 1308 product(intx, ProfileMaturityPercentage, 20, \ 1309 "number of method invocations/branches (expressed as % of " \ 1310 "CompileThreshold) before using the method's profile") \ 1311 range(0, 100) \ 1312 \ 1313 diagnostic(bool, PrintMethodData, false, \ 1314 "Print the results of +ProfileInterpreter at end of run") \ 1315 \ 1316 develop(bool, VerifyDataPointer, trueInDebug, \ 1317 "Verify the method data pointer during interpreter profiling") \ 1318 \ 1319 develop(bool, VerifyCompiledCode, false, \ 1320 "Include miscellaneous runtime verifications in nmethod code; " \ 1321 "default off because it disturbs nmethod size heuristics") \ 1322 \ 1323 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1324 "Manually make GC thread crash then dump java stack trace; " \ 1325 "Test only") \ 1326 \ 1327 /* compilation */ \ 1328 product(bool, UseCompiler, true, \ 1329 "Use Just-In-Time compilation") \ 1330 \ 1331 product(bool, UseCounterDecay, true, \ 1332 "Adjust recompilation counters") \ 1333 \ 1334 develop(intx, CounterHalfLifeTime, 30, \ 1335 "Half-life time of invocation counters (in seconds)") \ 1336 \ 1337 develop(intx, CounterDecayMinIntervalLength, 500, \ 1338 "The minimum interval (in milliseconds) between invocation of " \ 1339 "CounterDecay") \ 1340 \ 1341 product(bool, AlwaysCompileLoopMethods, false, \ 1342 "When using recompilation, never interpret methods " \ 1343 "containing loops") \ 1344 \ 1345 product(bool, DontCompileHugeMethods, true, \ 1346 "Do not compile methods > HugeMethodLimit") \ 1347 \ 1348 /* Bytecode escape analysis estimation. */ \ 1349 product(bool, EstimateArgEscape, true, \ 1350 "Analyze bytecodes to estimate escape state of arguments") \ 1351 \ 1352 product(intx, BCEATraceLevel, 0, \ 1353 "How much tracing to do of bytecode escape analysis estimates " \ 1354 "(0-3)") \ 1355 range(0, 3) \ 1356 \ 1357 product(intx, MaxBCEAEstimateLevel, 5, \ 1358 "Maximum number of nested calls that are analyzed by BC EA") \ 1359 range(0, max_jint) \ 1360 \ 1361 product(intx, MaxBCEAEstimateSize, 150, \ 1362 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1363 range(0, max_jint) \ 1364 \ 1365 product(intx, AllocatePrefetchStyle, 1, \ 1366 "0 = no prefetch, " \ 1367 "1 = generate prefetch instructions for each allocation, " \ 1368 "2 = use TLAB watermark to gate allocation prefetch, " \ 1369 "3 = generate one prefetch instruction per cache line") \ 1370 range(0, 3) \ 1371 \ 1372 product(intx, AllocatePrefetchDistance, -1, \ 1373 "Distance to prefetch ahead of allocation pointer. " \ 1374 "-1: use system-specific value (automatically determined") \ 1375 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1376 \ 1377 product(intx, AllocatePrefetchLines, 3, \ 1378 "Number of lines to prefetch ahead of array allocation pointer") \ 1379 range(1, 64) \ 1380 \ 1381 product(intx, AllocateInstancePrefetchLines, 1, \ 1382 "Number of lines to prefetch ahead of instance allocation " \ 1383 "pointer") \ 1384 range(1, 64) \ 1385 \ 1386 product(intx, AllocatePrefetchStepSize, 16, \ 1387 "Step size in bytes of sequential prefetch instructions") \ 1388 range(1, 512) \ 1389 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1390 \ 1391 product(intx, AllocatePrefetchInstr, 0, \ 1392 "Select instruction to prefetch ahead of allocation pointer") \ 1393 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1394 \ 1395 /* deoptimization */ \ 1396 develop(bool, TraceDeoptimization, false, \ 1397 "Trace deoptimization") \ 1398 \ 1399 develop(bool, PrintDeoptimizationDetails, false, \ 1400 "Print more information about deoptimization") \ 1401 \ 1402 develop(bool, DebugDeoptimization, false, \ 1403 "Tracing various information while debugging deoptimization") \ 1404 \ 1405 product(intx, SelfDestructTimer, 0, \ 1406 "Will cause VM to terminate after a given time (in minutes) " \ 1407 "(0 means off)") \ 1408 range(0, max_intx) \ 1409 \ 1410 product(intx, MaxJavaStackTraceDepth, 1024, \ 1411 "The maximum number of lines in the stack trace for Java " \ 1412 "exceptions (0 means all)") \ 1413 range(0, max_jint/2) \ 1414 \ 1415 /* notice: the max range value here is max_jint, not max_intx */ \ 1416 /* because of overflow issue */ \ 1417 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1418 "Guarantee a safepoint (at least) every so many milliseconds " \ 1419 "(0 means none)") \ 1420 range(0, max_jint) \ 1421 \ 1422 product(intx, SafepointTimeoutDelay, 10000, \ 1423 "Delay in milliseconds for option SafepointTimeout") \ 1424 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1425 NOT_LP64(range(0, max_intx)) \ 1426 \ 1427 product(intx, NmethodSweepActivity, 10, \ 1428 "Removes cold nmethods from code cache if > 0. Higher values " \ 1429 "result in more aggressive sweeping") \ 1430 range(0, 2000) \ 1431 \ 1432 notproduct(bool, LogSweeper, false, \ 1433 "Keep a ring buffer of sweeper activity") \ 1434 \ 1435 notproduct(intx, SweeperLogEntries, 1024, \ 1436 "Number of records in the ring buffer of sweeper activity") \ 1437 \ 1438 notproduct(intx, MemProfilingInterval, 500, \ 1439 "Time between each invocation of the MemProfiler") \ 1440 \ 1441 develop(intx, MallocCatchPtr, -1, \ 1442 "Hit breakpoint when mallocing/freeing this pointer") \ 1443 \ 1444 notproduct(ccstrlist, SuppressErrorAt, "", \ 1445 "List of assertions (file:line) to muzzle") \ 1446 \ 1447 develop(intx, StackPrintLimit, 100, \ 1448 "number of stack frames to print in VM-level stack dump") \ 1449 \ 1450 notproduct(intx, MaxElementPrintSize, 256, \ 1451 "maximum number of elements to print") \ 1452 \ 1453 notproduct(intx, MaxSubklassPrintSize, 4, \ 1454 "maximum number of subklasses to print when printing klass") \ 1455 \ 1456 product(intx, MaxInlineLevel, 15, \ 1457 "maximum number of nested calls that are inlined") \ 1458 range(0, max_jint) \ 1459 \ 1460 product(intx, MaxRecursiveInlineLevel, 1, \ 1461 "maximum number of nested recursive calls that are inlined") \ 1462 range(0, max_jint) \ 1463 \ 1464 develop(intx, MaxForceInlineLevel, 100, \ 1465 "maximum number of nested calls that are forced for inlining " \ 1466 "(using CompileCommand or marked w/ @ForceInline)") \ 1467 range(0, max_jint) \ 1468 \ 1469 product_pd(intx, InlineSmallCode, \ 1470 "Only inline already compiled methods if their code size is " \ 1471 "less than this") \ 1472 range(0, max_jint) \ 1473 \ 1474 product(intx, MaxInlineSize, 35, \ 1475 "The maximum bytecode size of a method to be inlined") \ 1476 range(0, max_jint) \ 1477 \ 1478 product_pd(intx, FreqInlineSize, \ 1479 "The maximum bytecode size of a frequent method to be inlined") \ 1480 range(0, max_jint) \ 1481 \ 1482 product(intx, MaxTrivialSize, 6, \ 1483 "The maximum bytecode size of a trivial method to be inlined") \ 1484 range(0, max_jint) \ 1485 \ 1486 product(intx, MinInliningThreshold, 250, \ 1487 "The minimum invocation count a method needs to have to be " \ 1488 "inlined") \ 1489 range(0, max_jint) \ 1490 \ 1491 develop(intx, MethodHistogramCutoff, 100, \ 1492 "The cutoff value for method invocation histogram (+CountCalls)") \ 1493 \ 1494 develop(intx, DontYieldALotInterval, 10, \ 1495 "Interval between which yields will be dropped (milliseconds)") \ 1496 \ 1497 notproduct(intx, DeoptimizeALotInterval, 5, \ 1498 "Number of exits until DeoptimizeALot kicks in") \ 1499 \ 1500 notproduct(intx, ZombieALotInterval, 5, \ 1501 "Number of exits until ZombieALot kicks in") \ 1502 \ 1503 diagnostic(uintx, MallocMaxTestWords, 0, \ 1504 "If non-zero, maximum number of words that malloc/realloc can " \ 1505 "allocate (for testing only)") \ 1506 range(0, max_uintx) \ 1507 \ 1508 product(intx, TypeProfileWidth, 2, \ 1509 "Number of receiver types to record in call/cast profile") \ 1510 range(0, 8) \ 1511 \ 1512 develop(intx, BciProfileWidth, 2, \ 1513 "Number of return bci's to record in ret profile") \ 1514 \ 1515 product(intx, PerMethodRecompilationCutoff, 400, \ 1516 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1517 range(-1, max_intx) \ 1518 \ 1519 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1520 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1521 range(-1, max_intx) \ 1522 \ 1523 product(intx, PerMethodTrapLimit, 100, \ 1524 "Limit on traps (of one kind) in a method (includes inlines)") \ 1525 range(0, max_jint) \ 1526 \ 1527 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1528 "Limit on speculative traps (of one kind) in a method " \ 1529 "(includes inlines)") \ 1530 range(0, max_jint) \ 1531 \ 1532 product(intx, PerBytecodeTrapLimit, 4, \ 1533 "Limit on traps (of one kind) at a particular BCI") \ 1534 range(0, max_jint) \ 1535 \ 1536 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1537 "Extra method data trap entries for speculation") \ 1538 \ 1539 develop(intx, InlineFrequencyRatio, 20, \ 1540 "Ratio of call site execution to caller method invocation") \ 1541 range(0, max_jint) \ 1542 \ 1543 diagnostic_pd(intx, InlineFrequencyCount, \ 1544 "Count of call site execution necessary to trigger frequent " \ 1545 "inlining") \ 1546 range(0, max_jint) \ 1547 \ 1548 develop(intx, InlineThrowCount, 50, \ 1549 "Force inlining of interpreted methods that throw this often") \ 1550 range(0, max_jint) \ 1551 \ 1552 develop(intx, InlineThrowMaxSize, 200, \ 1553 "Force inlining of throwing methods smaller than this") \ 1554 range(0, max_jint) \ 1555 \ 1556 develop(intx, ProfilerNodeSize, 1024, \ 1557 "Size in K to allocate for the Profile Nodes of each thread") \ 1558 range(0, 1024) \ 1559 \ 1560 product_pd(size_t, MetaspaceSize, \ 1561 "Initial threshold (in bytes) at which a garbage collection " \ 1562 "is done to reduce Metaspace usage") \ 1563 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1564 \ 1565 product(size_t, MaxMetaspaceSize, max_uintx, \ 1566 "Maximum size of Metaspaces (in bytes)") \ 1567 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1568 \ 1569 product(size_t, CompressedClassSpaceSize, 1*G, \ 1570 "Maximum size of class area in Metaspace when compressed " \ 1571 "class pointers are used") \ 1572 range(1*M, 3*G) \ 1573 \ 1574 manageable(uintx, MinHeapFreeRatio, 40, \ 1575 "The minimum percentage of heap free after GC to avoid expansion."\ 1576 " For most GCs this applies to the old generation. In G1 and" \ 1577 " ParallelGC it applies to the whole heap.") \ 1578 range(0, 100) \ 1579 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1580 \ 1581 manageable(uintx, MaxHeapFreeRatio, 70, \ 1582 "The maximum percentage of heap free after GC to avoid shrinking."\ 1583 " For most GCs this applies to the old generation. In G1 and" \ 1584 " ParallelGC it applies to the whole heap.") \ 1585 range(0, 100) \ 1586 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1587 \ 1588 product(bool, ShrinkHeapInSteps, true, \ 1589 "When disabled, informs the GC to shrink the java heap directly" \ 1590 " to the target size at the next full GC rather than requiring" \ 1591 " smaller steps during multiple full GCs.") \ 1592 \ 1593 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1594 "Number of milliseconds per MB of free space in the heap") \ 1595 range(0, max_intx) \ 1596 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1597 \ 1598 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1599 "The minimum change in heap space due to GC (in bytes)") \ 1600 range(0, max_uintx) \ 1601 \ 1602 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1603 "The minimum expansion of Metaspace (in bytes)") \ 1604 range(0, max_uintx) \ 1605 \ 1606 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1607 "The maximum percentage of Metaspace free after GC to avoid " \ 1608 "shrinking") \ 1609 range(0, 100) \ 1610 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1611 \ 1612 product(uintx, MinMetaspaceFreeRatio, 40, \ 1613 "The minimum percentage of Metaspace free after GC to avoid " \ 1614 "expansion") \ 1615 range(0, 99) \ 1616 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1617 \ 1618 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1619 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1620 range(0, max_uintx) \ 1621 \ 1622 /* stack parameters */ \ 1623 product_pd(intx, StackYellowPages, \ 1624 "Number of yellow zone (recoverable overflows) pages of size " \ 1625 "4KB. If pages are bigger yellow zone is aligned up.") \ 1626 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1627 \ 1628 product_pd(intx, StackRedPages, \ 1629 "Number of red zone (unrecoverable overflows) pages of size " \ 1630 "4KB. If pages are bigger red zone is aligned up.") \ 1631 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1632 \ 1633 product_pd(intx, StackReservedPages, \ 1634 "Number of reserved zone (reserved to annotated methods) pages" \ 1635 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1636 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1637 \ 1638 product(bool, RestrictReservedStack, true, \ 1639 "Restrict @ReservedStackAccess to trusted classes") \ 1640 \ 1641 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1642 product_pd(intx, StackShadowPages, \ 1643 "Number of shadow zone (for overflow checking) pages of size " \ 1644 "4KB. If pages are bigger shadow zone is aligned up. " \ 1645 "This should exceed the depth of the VM and native call stack.") \ 1646 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1647 \ 1648 product_pd(intx, ThreadStackSize, \ 1649 "Thread Stack Size (in Kbytes)") \ 1650 range(0, 1 * M) \ 1651 \ 1652 product_pd(intx, VMThreadStackSize, \ 1653 "Non-Java Thread Stack Size (in Kbytes)") \ 1654 range(0, max_intx/(1 * K)) \ 1655 \ 1656 product_pd(intx, CompilerThreadStackSize, \ 1657 "Compiler Thread Stack Size (in Kbytes)") \ 1658 range(0, max_intx/(1 * K)) \ 1659 \ 1660 develop_pd(size_t, JVMInvokeMethodSlack, \ 1661 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1662 \ 1663 /* code cache parameters */ \ 1664 develop_pd(uintx, CodeCacheSegmentSize, \ 1665 "Code cache segment size (in bytes) - smallest unit of " \ 1666 "allocation") \ 1667 range(1, 1024) \ 1668 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1669 \ 1670 develop_pd(intx, CodeEntryAlignment, \ 1671 "Code entry alignment for generated code (in bytes)") \ 1672 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1673 \ 1674 product_pd(intx, OptoLoopAlignment, \ 1675 "Align inner loops to zero relative to this modulus") \ 1676 range(1, 16) \ 1677 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1678 \ 1679 product_pd(uintx, InitialCodeCacheSize, \ 1680 "Initial code cache size (in bytes)") \ 1681 range(os::vm_page_size(), max_uintx) \ 1682 \ 1683 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1684 "Minimum code cache size (in bytes) required to start VM.") \ 1685 range(0, max_uintx) \ 1686 \ 1687 product(bool, SegmentedCodeCache, false, \ 1688 "Use a segmented code cache") \ 1689 \ 1690 product_pd(uintx, ReservedCodeCacheSize, \ 1691 "Reserved code cache size (in bytes) - maximum code cache size") \ 1692 range(os::vm_page_size(), max_uintx) \ 1693 \ 1694 product_pd(uintx, NonProfiledCodeHeapSize, \ 1695 "Size of code heap with non-profiled methods (in bytes)") \ 1696 range(0, max_uintx) \ 1697 \ 1698 product_pd(uintx, ProfiledCodeHeapSize, \ 1699 "Size of code heap with profiled methods (in bytes)") \ 1700 range(0, max_uintx) \ 1701 \ 1702 product_pd(uintx, NonNMethodCodeHeapSize, \ 1703 "Size of code heap with non-nmethods (in bytes)") \ 1704 range(os::vm_page_size(), max_uintx) \ 1705 \ 1706 product_pd(uintx, CodeCacheExpansionSize, \ 1707 "Code cache expansion size (in bytes)") \ 1708 range(32*K, max_uintx) \ 1709 \ 1710 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1711 "Minimum number of segments in a code cache block") \ 1712 range(1, 100) \ 1713 \ 1714 notproduct(bool, ExitOnFullCodeCache, false, \ 1715 "Exit the VM if we fill the code cache") \ 1716 \ 1717 product(bool, UseCodeCacheFlushing, true, \ 1718 "Remove cold/old nmethods from the code cache") \ 1719 \ 1720 product(uintx, StartAggressiveSweepingAt, 10, \ 1721 "Start aggressive sweeping if X[%] of the code cache is free." \ 1722 "Segmented code cache: X[%] of the non-profiled heap." \ 1723 "Non-segmented code cache: X[%] of the total code cache") \ 1724 range(0, 100) \ 1725 \ 1726 /* AOT parameters */ \ 1727 experimental(bool, UseAOT, false, \ 1728 "Use AOT compiled files") \ 1729 \ 1730 experimental(ccstrlist, AOTLibrary, NULL, \ 1731 "AOT library") \ 1732 \ 1733 experimental(bool, PrintAOT, false, \ 1734 "Print used AOT klasses and methods") \ 1735 \ 1736 notproduct(bool, PrintAOTStatistics, false, \ 1737 "Print AOT statistics") \ 1738 \ 1739 diagnostic(bool, UseAOTStrictLoading, false, \ 1740 "Exit the VM if any of the AOT libraries has invalid config") \ 1741 \ 1742 product(bool, CalculateClassFingerprint, false, \ 1743 "Calculate class fingerprint") \ 1744 \ 1745 /* interpreter debugging */ \ 1746 develop(intx, BinarySwitchThreshold, 5, \ 1747 "Minimal number of lookupswitch entries for rewriting to binary " \ 1748 "switch") \ 1749 \ 1750 develop(intx, StopInterpreterAt, 0, \ 1751 "Stop interpreter execution at specified bytecode number") \ 1752 \ 1753 develop(intx, TraceBytecodesAt, 0, \ 1754 "Trace bytecodes starting with specified bytecode number") \ 1755 \ 1756 /* compiler interface */ \ 1757 develop(intx, CIStart, 0, \ 1758 "The id of the first compilation to permit") \ 1759 \ 1760 develop(intx, CIStop, max_jint, \ 1761 "The id of the last compilation to permit") \ 1762 \ 1763 develop(intx, CIStartOSR, 0, \ 1764 "The id of the first osr compilation to permit " \ 1765 "(CICountOSR must be on)") \ 1766 \ 1767 develop(intx, CIStopOSR, max_jint, \ 1768 "The id of the last osr compilation to permit " \ 1769 "(CICountOSR must be on)") \ 1770 \ 1771 develop(intx, CIBreakAtOSR, -1, \ 1772 "The id of osr compilation to break at") \ 1773 \ 1774 develop(intx, CIBreakAt, -1, \ 1775 "The id of compilation to break at") \ 1776 \ 1777 product(ccstrlist, CompileOnly, "", \ 1778 "List of methods (pkg/class.name) to restrict compilation to") \ 1779 \ 1780 product(ccstr, CompileCommandFile, NULL, \ 1781 "Read compiler commands from this file [.hotspot_compiler]") \ 1782 \ 1783 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1784 "Read compiler directives from this file") \ 1785 \ 1786 product(ccstrlist, CompileCommand, "", \ 1787 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1788 \ 1789 develop(bool, ReplayCompiles, false, \ 1790 "Enable replay of compilations from ReplayDataFile") \ 1791 \ 1792 product(ccstr, ReplayDataFile, NULL, \ 1793 "File containing compilation replay information" \ 1794 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1795 \ 1796 product(ccstr, InlineDataFile, NULL, \ 1797 "File containing inlining replay information" \ 1798 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1799 \ 1800 develop(intx, ReplaySuppressInitializers, 2, \ 1801 "Control handling of class initialization during replay: " \ 1802 "0 - don't do anything special; " \ 1803 "1 - treat all class initializers as empty; " \ 1804 "2 - treat class initializers for application classes as empty; " \ 1805 "3 - allow all class initializers to run during bootstrap but " \ 1806 " pretend they are empty after starting replay") \ 1807 range(0, 3) \ 1808 \ 1809 develop(bool, ReplayIgnoreInitErrors, false, \ 1810 "Ignore exceptions thrown during initialization for replay") \ 1811 \ 1812 product(bool, DumpReplayDataOnError, true, \ 1813 "Record replay data for crashing compiler threads") \ 1814 \ 1815 product(bool, CICompilerCountPerCPU, false, \ 1816 "1 compiler thread for log(N CPUs)") \ 1817 \ 1818 notproduct(intx, CICrashAt, -1, \ 1819 "id of compilation to trigger assert in compiler thread for " \ 1820 "the purpose of testing, e.g. generation of replay data") \ 1821 notproduct(bool, CIObjectFactoryVerify, false, \ 1822 "enable potentially expensive verification in ciObjectFactory") \ 1823 \ 1824 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1825 "Abort VM when method had failed to compile.") \ 1826 \ 1827 /* Priorities */ \ 1828 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1829 \ 1830 product(intx, ThreadPriorityPolicy, 0, \ 1831 "0 : Normal. "\ 1832 " VM chooses priorities that are appropriate for normal "\ 1833 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1834 " to normal native priority. Java priorities below " \ 1835 " NORM_PRIORITY map to lower native priority values. On "\ 1836 " Windows applications are allowed to use higher native "\ 1837 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1838 " not use the highest possible native priority, "\ 1839 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1840 " system threads. On Linux thread priorities are ignored "\ 1841 " because the OS does not support static priority in "\ 1842 " SCHED_OTHER scheduling class which is the only choice for "\ 1843 " non-root, non-realtime applications. "\ 1844 "1 : Aggressive. "\ 1845 " Java thread priorities map over to the entire range of "\ 1846 " native thread priorities. Higher Java thread priorities map "\ 1847 " to higher native thread priorities. This policy should be "\ 1848 " used with care, as sometimes it can cause performance "\ 1849 " degradation in the application and/or the entire system. On "\ 1850 " Linux/BSD/macOS this policy requires root privilege or an "\ 1851 " extended capability.") \ 1852 range(0, 1) \ 1853 \ 1854 product(bool, ThreadPriorityVerbose, false, \ 1855 "Print priority changes") \ 1856 \ 1857 product(intx, CompilerThreadPriority, -1, \ 1858 "The native priority at which compiler threads should run " \ 1859 "(-1 means no change)") \ 1860 range(min_jint, max_jint) \ 1861 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1862 \ 1863 product(intx, VMThreadPriority, -1, \ 1864 "The native priority at which the VM thread should run " \ 1865 "(-1 means no change)") \ 1866 range(-1, 127) \ 1867 \ 1868 product(intx, JavaPriority1_To_OSPriority, -1, \ 1869 "Map Java priorities to OS priorities") \ 1870 range(-1, 127) \ 1871 \ 1872 product(intx, JavaPriority2_To_OSPriority, -1, \ 1873 "Map Java priorities to OS priorities") \ 1874 range(-1, 127) \ 1875 \ 1876 product(intx, JavaPriority3_To_OSPriority, -1, \ 1877 "Map Java priorities to OS priorities") \ 1878 range(-1, 127) \ 1879 \ 1880 product(intx, JavaPriority4_To_OSPriority, -1, \ 1881 "Map Java priorities to OS priorities") \ 1882 range(-1, 127) \ 1883 \ 1884 product(intx, JavaPriority5_To_OSPriority, -1, \ 1885 "Map Java priorities to OS priorities") \ 1886 range(-1, 127) \ 1887 \ 1888 product(intx, JavaPriority6_To_OSPriority, -1, \ 1889 "Map Java priorities to OS priorities") \ 1890 range(-1, 127) \ 1891 \ 1892 product(intx, JavaPriority7_To_OSPriority, -1, \ 1893 "Map Java priorities to OS priorities") \ 1894 range(-1, 127) \ 1895 \ 1896 product(intx, JavaPriority8_To_OSPriority, -1, \ 1897 "Map Java priorities to OS priorities") \ 1898 range(-1, 127) \ 1899 \ 1900 product(intx, JavaPriority9_To_OSPriority, -1, \ 1901 "Map Java priorities to OS priorities") \ 1902 range(-1, 127) \ 1903 \ 1904 product(intx, JavaPriority10_To_OSPriority,-1, \ 1905 "Map Java priorities to OS priorities") \ 1906 range(-1, 127) \ 1907 \ 1908 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1909 "Java thread priority 10 maps to critical scheduling priority") \ 1910 \ 1911 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1912 "Compiler thread(s) run at critical scheduling priority") \ 1913 \ 1914 develop(intx, NewCodeParameter, 0, \ 1915 "Testing Only: Create a dedicated integer parameter before " \ 1916 "putback") \ 1917 \ 1918 /* new oopmap storage allocation */ \ 1919 develop(intx, MinOopMapAllocation, 8, \ 1920 "Minimum number of OopMap entries in an OopMapSet") \ 1921 \ 1922 /* Background Compilation */ \ 1923 develop(intx, LongCompileThreshold, 50, \ 1924 "Used with +TraceLongCompiles") \ 1925 \ 1926 /* recompilation */ \ 1927 product_pd(intx, CompileThreshold, \ 1928 "number of interpreted method invocations before (re-)compiling") \ 1929 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1930 \ 1931 product(double, CompileThresholdScaling, 1.0, \ 1932 "Factor to control when first compilation happens " \ 1933 "(both with and without tiered compilation): " \ 1934 "values greater than 1.0 delay counter overflow, " \ 1935 "values between 0 and 1.0 rush counter overflow, " \ 1936 "value of 1.0 leaves compilation thresholds unchanged " \ 1937 "value of 0.0 is equivalent to -Xint. " \ 1938 "" \ 1939 "Flag can be set as per-method option. " \ 1940 "If a value is specified for a method, compilation thresholds " \ 1941 "for that method are scaled by both the value of the global flag "\ 1942 "and the value of the per-method flag.") \ 1943 range(0.0, DBL_MAX) \ 1944 \ 1945 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1946 "Interpreter (tier 0) invocation notification frequency") \ 1947 range(0, 30) \ 1948 \ 1949 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1950 "C1 without MDO (tier 2) invocation notification frequency") \ 1951 range(0, 30) \ 1952 \ 1953 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 1954 "C1 with MDO profiling (tier 3) invocation notification " \ 1955 "frequency") \ 1956 range(0, 30) \ 1957 \ 1958 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 1959 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 1960 range(0, 30) \ 1961 \ 1962 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 1963 "Interpreter (tier 0) invocation notification frequency") \ 1964 range(0, 30) \ 1965 \ 1966 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 1967 "C1 without MDO (tier 2) invocation notification frequency") \ 1968 range(0, 30) \ 1969 \ 1970 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 1971 "C1 with MDO profiling (tier 3) invocation notification " \ 1972 "frequency") \ 1973 range(0, 30) \ 1974 \ 1975 product(intx, Tier2CompileThreshold, 0, \ 1976 "threshold at which tier 2 compilation is invoked") \ 1977 range(0, max_jint) \ 1978 \ 1979 product(intx, Tier2BackEdgeThreshold, 0, \ 1980 "Back edge threshold at which tier 2 compilation is invoked") \ 1981 range(0, max_jint) \ 1982 \ 1983 product(intx, Tier3InvocationThreshold, 200, \ 1984 "Compile if number of method invocations crosses this " \ 1985 "threshold") \ 1986 range(0, max_jint) \ 1987 \ 1988 product(intx, Tier3MinInvocationThreshold, 100, \ 1989 "Minimum invocation to compile at tier 3") \ 1990 range(0, max_jint) \ 1991 \ 1992 product(intx, Tier3CompileThreshold, 2000, \ 1993 "Threshold at which tier 3 compilation is invoked (invocation " \ 1994 "minimum must be satisfied)") \ 1995 range(0, max_jint) \ 1996 \ 1997 product(intx, Tier3BackEdgeThreshold, 60000, \ 1998 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 1999 range(0, max_jint) \ 2000 \ 2001 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2002 "Compile if number of method invocations crosses this " \ 2003 "threshold if coming from AOT") \ 2004 range(0, max_jint) \ 2005 \ 2006 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2007 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2008 range(0, max_jint) \ 2009 \ 2010 product(intx, Tier3AOTCompileThreshold, 15000, \ 2011 "Threshold at which tier 3 compilation is invoked (invocation " \ 2012 "minimum must be satisfied) if coming from AOT") \ 2013 range(0, max_jint) \ 2014 \ 2015 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2016 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2017 "if coming from AOT") \ 2018 range(0, max_jint) \ 2019 \ 2020 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2021 "Switch to interpreter to profile if the number of method " \ 2022 "invocations crosses this threshold if coming from AOT " \ 2023 "(applicable only with " \ 2024 "CompilationMode=high-only|high-only-quick-internal)") \ 2025 range(0, max_jint) \ 2026 \ 2027 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2028 "Minimum number of invocations to switch to interpreter " \ 2029 "to profile if coming from AOT " \ 2030 "(applicable only with " \ 2031 "CompilationMode=high-only|high-only-quick-internal)") \ 2032 range(0, max_jint) \ 2033 \ 2034 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2035 "Threshold at which to switch to interpreter to profile " \ 2036 "if coming from AOT " \ 2037 "(invocation minimum must be satisfied, " \ 2038 "applicable only with " \ 2039 "CompilationMode=high-only|high-only-quick-internal)") \ 2040 range(0, max_jint) \ 2041 \ 2042 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2043 "Back edge threshold at which to switch to interpreter " \ 2044 "to profile if coming from AOT " \ 2045 "(applicable only with " \ 2046 "CompilationMode=high-only|high-only-quick-internal)") \ 2047 range(0, max_jint) \ 2048 \ 2049 product(intx, Tier4InvocationThreshold, 5000, \ 2050 "Compile if number of method invocations crosses this " \ 2051 "threshold") \ 2052 range(0, max_jint) \ 2053 \ 2054 product(intx, Tier4MinInvocationThreshold, 600, \ 2055 "Minimum invocation to compile at tier 4") \ 2056 range(0, max_jint) \ 2057 \ 2058 product(intx, Tier4CompileThreshold, 15000, \ 2059 "Threshold at which tier 4 compilation is invoked (invocation " \ 2060 "minimum must be satisfied)") \ 2061 range(0, max_jint) \ 2062 \ 2063 product(intx, Tier4BackEdgeThreshold, 40000, \ 2064 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2065 range(0, max_jint) \ 2066 \ 2067 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2068 "Compile if number of method invocations crosses this " \ 2069 "threshold (applicable only with " \ 2070 "CompilationMode=high-only|high-only-quick-internal)") \ 2071 range(0, max_jint) \ 2072 \ 2073 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2074 "Minimum number of invocations to compile at tier 4 " \ 2075 "(applicable only with " \ 2076 "CompilationMode=high-only|high-only-quick-internal)") \ 2077 range(0, max_jint) \ 2078 \ 2079 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2080 "Threshold at which tier 4 compilation is invoked (invocation " \ 2081 "minimum must be satisfied, applicable only with " \ 2082 "CompilationMode=high-only|high-only-quick-internal)") \ 2083 range(0, max_jint) \ 2084 \ 2085 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2086 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2087 "(applicable only with " \ 2088 "CompilationMode=high-only|high-only-quick-internal)") \ 2089 range(0, max_jint) \ 2090 \ 2091 diagnostic(intx, Tier0Delay, 5, \ 2092 "If C2 queue size grows over this amount per compiler thread " \ 2093 "do not start profiling in the interpreter " \ 2094 "(applicable only with " \ 2095 "CompilationMode=high-only|high-only-quick-internal)") \ 2096 range(0, max_jint) \ 2097 \ 2098 product(intx, Tier3DelayOn, 5, \ 2099 "If C2 queue size grows over this amount per compiler thread " \ 2100 "stop compiling at tier 3 and start compiling at tier 2") \ 2101 range(0, max_jint) \ 2102 \ 2103 product(intx, Tier3DelayOff, 2, \ 2104 "If C2 queue size is less than this amount per compiler thread " \ 2105 "allow methods compiled at tier 2 transition to tier 3") \ 2106 range(0, max_jint) \ 2107 \ 2108 product(intx, Tier3LoadFeedback, 5, \ 2109 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2110 "reaches this amount per compiler thread") \ 2111 range(0, max_jint) \ 2112 \ 2113 product(intx, Tier4LoadFeedback, 3, \ 2114 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2115 "reaches this amount per compiler thread") \ 2116 range(0, max_jint) \ 2117 \ 2118 product(intx, TieredCompileTaskTimeout, 50, \ 2119 "Kill compile task if method was not used within " \ 2120 "given timeout in milliseconds") \ 2121 range(0, max_intx) \ 2122 \ 2123 product(intx, TieredStopAtLevel, 4, \ 2124 "Stop at given compilation level") \ 2125 range(0, 4) \ 2126 \ 2127 product(intx, Tier0ProfilingStartPercentage, 200, \ 2128 "Start profiling in interpreter if the counters exceed tier 3 " \ 2129 "thresholds (tier 4 thresholds with " \ 2130 "CompilationMode=high-only|high-only-quick-internal)" \ 2131 "by the specified percentage") \ 2132 range(0, max_jint) \ 2133 \ 2134 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2135 "Increase the compile threshold for C1 compilation if the code " \ 2136 "cache is filled by the specified percentage") \ 2137 range(0, 99) \ 2138 \ 2139 product(intx, TieredRateUpdateMinTime, 1, \ 2140 "Minimum rate sampling interval (in milliseconds)") \ 2141 range(0, max_intx) \ 2142 \ 2143 product(intx, TieredRateUpdateMaxTime, 25, \ 2144 "Maximum rate sampling interval (in milliseconds)") \ 2145 range(0, max_intx) \ 2146 \ 2147 product(ccstr, CompilationMode, "default", \ 2148 "Compilation modes: " \ 2149 "default: normal tiered compilation; " \ 2150 "quick-only: C1-only mode; " \ 2151 "high-only: C2/JVMCI-only mode; " \ 2152 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2153 "with JVMCI compiler compiled with C1.") \ 2154 \ 2155 product_pd(bool, TieredCompilation, \ 2156 "Enable tiered compilation") \ 2157 \ 2158 product(bool, PrintTieredEvents, false, \ 2159 "Print tiered events notifications") \ 2160 \ 2161 product_pd(intx, OnStackReplacePercentage, \ 2162 "NON_TIERED number of method invocations/branches (expressed as " \ 2163 "% of CompileThreshold) before (re-)compiling OSR code") \ 2164 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2165 \ 2166 product(intx, InterpreterProfilePercentage, 33, \ 2167 "NON_TIERED number of method invocations/branches (expressed as " \ 2168 "% of CompileThreshold) before profiling in the interpreter") \ 2169 range(0, 100) \ 2170 \ 2171 develop(intx, DesiredMethodLimit, 8000, \ 2172 "The desired maximum method size (in bytecodes) after inlining") \ 2173 \ 2174 develop(intx, HugeMethodLimit, 8000, \ 2175 "Don't compile methods larger than this if " \ 2176 "+DontCompileHugeMethods") \ 2177 \ 2178 /* Properties for Java libraries */ \ 2179 \ 2180 product(uint64_t, MaxDirectMemorySize, 0, \ 2181 "Maximum total size of NIO direct-buffer allocations") \ 2182 range(0, max_jlong) \ 2183 \ 2184 /* Flags used for temporary code during development */ \ 2185 \ 2186 diagnostic(bool, UseNewCode, false, \ 2187 "Testing Only: Use the new version while testing") \ 2188 \ 2189 diagnostic(bool, UseNewCode2, false, \ 2190 "Testing Only: Use the new version while testing") \ 2191 \ 2192 diagnostic(bool, UseNewCode3, false, \ 2193 "Testing Only: Use the new version while testing") \ 2194 \ 2195 /* flags for performance data collection */ \ 2196 \ 2197 product(bool, UsePerfData, true, \ 2198 "Flag to disable jvmstat instrumentation for performance testing "\ 2199 "and problem isolation purposes") \ 2200 \ 2201 product(bool, PerfDataSaveToFile, false, \ 2202 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2203 \ 2204 product(ccstr, PerfDataSaveFile, NULL, \ 2205 "Save PerfData memory to the specified absolute pathname. " \ 2206 "The string %p in the file name (if present) " \ 2207 "will be replaced by pid") \ 2208 \ 2209 product(intx, PerfDataSamplingInterval, 50, \ 2210 "Data sampling interval (in milliseconds)") \ 2211 range(PeriodicTask::min_interval, max_jint) \ 2212 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2213 \ 2214 product(bool, PerfDisableSharedMem, false, \ 2215 "Store performance data in standard memory") \ 2216 \ 2217 product(intx, PerfDataMemorySize, 32*K, \ 2218 "Size of performance data memory region. Will be rounded " \ 2219 "up to a multiple of the native os page size.") \ 2220 range(128, 32*64*K) \ 2221 \ 2222 product(intx, PerfMaxStringConstLength, 1024, \ 2223 "Maximum PerfStringConstant string length before truncation") \ 2224 range(32, 32*K) \ 2225 \ 2226 product(bool, PerfAllowAtExitRegistration, false, \ 2227 "Allow registration of atexit() methods") \ 2228 \ 2229 product(bool, PerfBypassFileSystemCheck, false, \ 2230 "Bypass Win32 file system criteria checks (Windows Only)") \ 2231 \ 2232 product(intx, UnguardOnExecutionViolation, 0, \ 2233 "Unguard page and retry on no-execute fault (Win32 only) " \ 2234 "0=off, 1=conservative, 2=aggressive") \ 2235 range(0, 2) \ 2236 \ 2237 /* Serviceability Support */ \ 2238 \ 2239 product(bool, ManagementServer, false, \ 2240 "Create JMX Management Server") \ 2241 \ 2242 product(bool, DisableAttachMechanism, false, \ 2243 "Disable mechanism that allows tools to attach to this VM") \ 2244 \ 2245 product(bool, StartAttachListener, false, \ 2246 "Always start Attach Listener at VM startup") \ 2247 \ 2248 product(bool, EnableDynamicAgentLoading, true, \ 2249 "Allow tools to load agents with the attach mechanism") \ 2250 \ 2251 manageable(bool, PrintConcurrentLocks, false, \ 2252 "Print java.util.concurrent locks in thread dump") \ 2253 \ 2254 /* Shared spaces */ \ 2255 \ 2256 product(bool, UseSharedSpaces, true, \ 2257 "Use shared spaces for metadata") \ 2258 \ 2259 product(bool, VerifySharedSpaces, false, \ 2260 "Verify integrity of shared spaces") \ 2261 \ 2262 product(bool, RequireSharedSpaces, false, \ 2263 "Require shared spaces for metadata") \ 2264 \ 2265 product(bool, DumpSharedSpaces, false, \ 2266 "Special mode: JVM reads a class list, loads classes, builds " \ 2267 "shared spaces, and dumps the shared spaces to a file to be " \ 2268 "used in future JVM runs") \ 2269 \ 2270 product(bool, DynamicDumpSharedSpaces, false, \ 2271 "Dynamic archive") \ 2272 \ 2273 product(bool, PrintSharedArchiveAndExit, false, \ 2274 "Print shared archive file contents") \ 2275 \ 2276 product(bool, PrintSharedDictionary, false, \ 2277 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2278 "dictionary") \ 2279 \ 2280 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2281 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2282 "Address to allocate shared memory region for class data") \ 2283 range(0, SIZE_MAX) \ 2284 \ 2285 product(ccstr, SharedArchiveConfigFile, NULL, \ 2286 "Data to add to the CDS archive file") \ 2287 \ 2288 product(uintx, SharedSymbolTableBucketSize, 4, \ 2289 "Average number of symbols per bucket in shared table") \ 2290 range(2, 246) \ 2291 \ 2292 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2293 "Allow Java agent to be run with CDS dumping") \ 2294 \ 2295 diagnostic(bool, PrintMethodHandleStubs, false, \ 2296 "Print generated stub code for method handles") \ 2297 \ 2298 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2299 "perform extra checks when constructing method handles") \ 2300 \ 2301 diagnostic(bool, ShowHiddenFrames, false, \ 2302 "show method handle implementation frames (usually hidden)") \ 2303 \ 2304 experimental(bool, TrustFinalNonStaticFields, false, \ 2305 "trust final non-static declarations for constant folding") \ 2306 \ 2307 diagnostic(bool, FoldStableValues, true, \ 2308 "Optimize loads from stable fields (marked w/ @Stable)") \ 2309 \ 2310 diagnostic(int, UseBootstrapCallInfo, 1, \ 2311 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2312 "resolved before the bootstrap method is called; 1: when a BSM " \ 2313 "that may accept a BootstrapCallInfo is detected, use that API " \ 2314 "to pass BSM arguments, which allows the BSM to delay their " \ 2315 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2316 "via that API, instead of with the eagerly-resolved array.") \ 2317 \ 2318 diagnostic(bool, PauseAtStartup, false, \ 2319 "Causes the VM to pause at startup time and wait for the pause " \ 2320 "file to be removed (default: ./vm.paused.<pid>)") \ 2321 \ 2322 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2323 "The file to create and for whose removal to await when pausing " \ 2324 "at startup. (default: ./vm.paused.<pid>)") \ 2325 \ 2326 diagnostic(bool, PauseAtExit, false, \ 2327 "Pause and wait for keypress on exit if a debugger is attached") \ 2328 \ 2329 product(bool, ExtendedDTraceProbes, false, \ 2330 "Enable performance-impacting dtrace probes") \ 2331 \ 2332 product(bool, DTraceMethodProbes, false, \ 2333 "Enable dtrace probes for method-entry and method-exit") \ 2334 \ 2335 product(bool, DTraceAllocProbes, false, \ 2336 "Enable dtrace probes for object allocation") \ 2337 \ 2338 product(bool, DTraceMonitorProbes, false, \ 2339 "Enable dtrace probes for monitor events") \ 2340 \ 2341 product(bool, RelaxAccessControlCheck, false, \ 2342 "Relax the access control checks in the verifier") \ 2343 \ 2344 product(uintx, StringTableSize, defaultStringTableSize, \ 2345 "Number of buckets in the interned String table " \ 2346 "(will be rounded to nearest higher power of 2)") \ 2347 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2348 \ 2349 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2350 "Number of buckets in the JVM internal Symbol table") \ 2351 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2352 \ 2353 product(bool, UseStringDeduplication, false, \ 2354 "Use string deduplication") \ 2355 \ 2356 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2357 "A string must reach this age (or be promoted to an old region) " \ 2358 "to be considered for deduplication") \ 2359 range(1, markWord::max_age) \ 2360 \ 2361 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2362 "Force table resize every time the table is scanned") \ 2363 \ 2364 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2365 "Force table rehash every time the table is scanned") \ 2366 \ 2367 diagnostic(bool, WhiteBoxAPI, false, \ 2368 "Enable internal testing APIs") \ 2369 \ 2370 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2371 "Default survivor space alignment in bytes") \ 2372 range(8, 256) \ 2373 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2374 \ 2375 product(ccstr, DumpLoadedClassList, NULL, \ 2376 "Dump the names all loaded classes, that could be stored into " \ 2377 "the CDS archive, in the specified file") \ 2378 \ 2379 product(ccstr, SharedClassListFile, NULL, \ 2380 "Override the default CDS class list") \ 2381 \ 2382 product(ccstr, SharedArchiveFile, NULL, \ 2383 "Override the default location of the CDS archive file") \ 2384 \ 2385 product(ccstr, ArchiveClassesAtExit, NULL, \ 2386 "The path and name of the dynamic archive file") \ 2387 \ 2388 product(ccstr, ExtraSharedClassListFile, NULL, \ 2389 "Extra classlist for building the CDS archive file") \ 2390 \ 2391 diagnostic(intx, ArchiveRelocationMode, 0, \ 2392 "(0) first map at preferred address, and if " \ 2393 "unsuccessful, map at alternative address (default); " \ 2394 "(1) always map at alternative address; " \ 2395 "(2) always map at preferred address, and if unsuccessful, " \ 2396 "do not map the archive") \ 2397 range(0, 2) \ 2398 \ 2399 experimental(size_t, ArrayAllocatorMallocLimit, \ 2400 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2401 "Allocation less than this value will be allocated " \ 2402 "using malloc. Larger allocations will use mmap.") \ 2403 \ 2404 experimental(bool, AlwaysAtomicAccesses, false, \ 2405 "Accesses to all variables should always be atomic") \ 2406 \ 2407 diagnostic(bool, UseUnalignedAccesses, false, \ 2408 "Use unaligned memory accesses in Unsafe") \ 2409 \ 2410 product_pd(bool, PreserveFramePointer, \ 2411 "Use the FP register for holding the frame pointer " \ 2412 "and not as a general purpose register.") \ 2413 \ 2414 diagnostic(bool, CheckIntrinsics, true, \ 2415 "When a class C is loaded, check that " \ 2416 "(1) all intrinsics defined by the VM for class C are present "\ 2417 "in the loaded class file and are marked with the " \ 2418 "@HotSpotIntrinsicCandidate annotation, that " \ 2419 "(2) there is an intrinsic registered for all loaded methods " \ 2420 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2421 "annotation, and that " \ 2422 "(3) no orphan methods exist for class C (i.e., methods for " \ 2423 "which the VM declares an intrinsic but that are not declared "\ 2424 "in the loaded class C. " \ 2425 "Check (3) is available only in debug builds.") \ 2426 \ 2427 diagnostic_pd(intx, InitArrayShortSize, \ 2428 "Threshold small size (in bytes) for clearing arrays. " \ 2429 "Anything this size or smaller may get converted to discrete " \ 2430 "scalar stores.") \ 2431 range(0, max_intx) \ 2432 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2433 \ 2434 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2435 "Disable backwards compatibility for compile commands.") \ 2436 \ 2437 diagnostic(bool, CompilerDirectivesPrint, false, \ 2438 "Print compiler directives on installation.") \ 2439 diagnostic(int, CompilerDirectivesLimit, 50, \ 2440 "Limit on number of compiler directives.") \ 2441 \ 2442 product(ccstr, AllocateHeapAt, NULL, \ 2443 "Path to the directoy where a temporary file will be created " \ 2444 "to use as the backing store for Java Heap.") \ 2445 \ 2446 experimental(ccstr, AllocateOldGenAt, NULL, \ 2447 "Path to the directoy where a temporary file will be " \ 2448 "created to use as the backing store for old generation." \ 2449 "File of size Xmx is pre-allocated for performance reason, so" \ 2450 "we need that much space available") \ 2451 \ 2452 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2453 "Run periodic metaspace verifications (0 - none, " \ 2454 "1 - always, >1 every nth interval)") \ 2455 \ 2456 diagnostic(bool, ShowRegistersOnAssert, true, \ 2457 "On internal errors, include registers in error report.") \ 2458 \ 2459 diagnostic(bool, UseSwitchProfiling, true, \ 2460 "leverage profiling for table/lookup switch") \ 2461 \ 2462 develop(bool, TraceMemoryWriteback, false, \ 2463 "Trace memory writeback operations") \ 2464 \ 2465 JFR_ONLY(product(bool, FlightRecorder, false, \ 2466 "(Deprecated) Enable Flight Recorder")) \ 2467 \ 2468 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2469 "Flight Recorder options")) \ 2470 \ 2471 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2472 "Start flight recording with options")) \ 2473 \ 2474 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2475 "Use platform unstable time where supported for timestamps only") \ 2476 \ 2477 product(bool, UseNewFieldLayout, true, \ 2478 "(Deprecated) Use new algorithm to compute field layouts") \ 2479 \ 2480 product(bool, UseEmptySlotsInSupers, true, \ 2481 "Allow allocating fields in empty slots of super-classes") \ 2482 \ 2483 diagnostic(bool, DeoptimizeNMethodBarriersALot, false, \ 2484 "Make nmethod barriers deoptimise a lot.") \ 2485 2486 // Interface macros 2487 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2488 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2489 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2490 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2491 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2492 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2493 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2494 #ifdef PRODUCT 2495 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2496 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2497 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2498 #else 2499 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2500 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2501 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2502 #endif // PRODUCT 2503 // Special LP64 flags, product only needed for now. 2504 #ifdef _LP64 2505 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2506 #else 2507 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2508 #endif // _LP64 2509 2510 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2511 DECLARE_PD_DEVELOPER_FLAG, \ 2512 DECLARE_PRODUCT_FLAG, \ 2513 DECLARE_PD_PRODUCT_FLAG, \ 2514 DECLARE_DIAGNOSTIC_FLAG, \ 2515 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2516 DECLARE_EXPERIMENTAL_FLAG, \ 2517 DECLARE_NOTPRODUCT_FLAG, \ 2518 DECLARE_MANAGEABLE_FLAG, \ 2519 DECLARE_PRODUCT_RW_FLAG, \ 2520 DECLARE_LP64_PRODUCT_FLAG, \ 2521 IGNORE_RANGE, \ 2522 IGNORE_CONSTRAINT) 2523 2524 #endif // SHARE_RUNTIME_GLOBALS_HPP